Foueths to the fulton ibon and engine wobks



(No Model.)

A. M. KERR.

LOOK FOR HOISTING TACKLE.

No. 389,155. Patented. Sept. 4 1888.

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UNITE STATES ATENT Fries.

ALEXANDER M. KERR, OF DETROIT, MICHIGAN, ASSIGNOR OF THREE- FOURTHS TO THE FULTON IRON AND ENGINE W'ORKS, OF SAME PLACE.

LOOK FOR HOISTING-TACKLE.

SPECIFICATION forming part of Letters Patent No. 389,155, dated September 4-, 1 888.

Application filed May 3, 1888. Serial No. 272,731.

To all whom it may concern:

Be it known that I, ALEXANDER M. KERR, of Detroit, in the county of \Vayne and State of Michigan, have invented a new and useful Improvement in Looks for Hoist-ing Tackle, of which the following is a specification.

My invention consists in an improved lock for hoisting-tackle, l1erei nafter fully described and claimed.

Figure l is an elevation of the tackle complete. Figs. 2 and 3 are side views of the upper and lower pulleys. Fig. 4 is a top plan view of the wedge, and Fig. 5 a side elevation of the wedge.

A represents a hook, the shank of which is fastened to a pin, B, which passes through the cheek-plates O of a pulley and serves to sup port them.

E arid H represent two sheavesjournaled on shafts F and G, sctin the cheek-plates C; but instead of being placed side by side, as usual, they are placed one behind the other, as clearly shown in Fig. 1.

Ifthepnlley is to have more than two sheaves, all but one may be placed side by side, as in the ordinary construction, (shown in the lower pulley, Fig. 3,) with one sheave placed back of one of the others, so that no matter how many sheaves there are in the upper block two of them will occupy the relations of the sheaves E and H.

T and R represent the sheaves of a double pulley of the ordinary construction journaled on the shaft Q, and provided with a stirrup, P, and foot S, for attachment to the load.

N represents a wedgeshaped piece of metal adapted to play between the adjacent faces of the sheaves E and H, and in its descent to wedge firmly between the rope on said sheaves.

0 represents a shaft journaled in the cheekplates 0, and carrying between those plates a cam, \V, which engages with wedge N, so that by rocking said shaft the wedge N can be lifted away from the sheaves.

D represents a lever secured to the end of shaft 0, by means of which, through a chain or rope attached thereto, the shaft 0 can be rotated.

(No model.)

The rope or chain is to be so rove that the sheaves E H will always turn in opposite directions, and this may be done as follows: The running end of the rope I passes above sheave H and then down, as shown at J, under sheave T, up, as shown at K, over sheave E, down, as shown at L, under sheave 1t, and then up, as shown at M, to its point of attachment to its cheek-plates O. This point of attachment is shown at one side in the drawings, in order to enable the different lengths of rope to be shown without conflict. It will be seen that whether the lower pulley is being raised or lowered the sheaves E H always turn in opposite direct-ions, either toward or away from each other, and the lengths of rope J and K will always run in the same direction, and will run downward when the lower pulley is descending. By permitting the wedge N to descend when the sheaves 1G H areturning to ward each other and the lengths of rope J K are running downward, it is evident that the wedge N will be drawn between said ropes and lock them, so as to hold the ropes stationary and arrest the lower pulley at any desired point in its descent. \Vhen the ropes J K run upward, which occurs in raising the lower pulley, the motion of the ropes lifts the wedge N, so that it does not interfere with their operation, and when it is desired to lower the lower pulley the wedge N is held up out of contact with the ropes J K by depressing the right-hand end of the lever D, Fig. 1, which causes the cam W to lift the wedge N away from the ropes and permits the sheaves to rotatc freely.

\Vhat I claim as my invention, and desire to secure by Letters Patent, is-

1. The combination, with a pulley block having two sheaves arranged one behind the other to turn in opposite directions, of a vertically-movable wedge suspended between the two sheaves,and having opposite inclined surfaces adapted to wedge between the opposite portions of a rope passing around the re spective sheaves, substantially as described.

2. The combination, with a pulleyblock having two sheaves arranged one behind the other to turn in opposite directions, of a vet-- ticallymovable wedge suspended between the two sheaves and having'its opposite in clined surfaces adapted to wedge between the 5 opposite portions of a rope passing around the respective sheaves, a rocking shaft journaled on the sheave-frame and having a cam engaging the wedge, and a lever, D, for rocking the earn-shaft, substantially as described.

ALEXANDER M. KERR.

Witnesses:

OYRUs E. LOTHROP, E. HESSELBAOHER. 

